When it’s cold outside, one way to help reduce heating costs is to close air registers in rooms that are rarely occupied so the heated air can be redirected to rooms you do use. But if you end up closing more than 50 percent of the registers in your house, your good intentions could literally backfire. This can complicate the flow resistance system of your HVAC, which can lead to complications and costly repairs. Instead, count how many registers you have and only close up to 20 percent of them to save energy and avoid damage to your system.
ANDREWS MCMEEL SYNDICATION